Table 1.

Demographic features of adult participants in the two survey modes

	Web-based survey	Paper-based survey	Difference, P value
Number of respondent, n	1854	9039
Sex distributiona, n (%)
Male	711 (38.3)	2955 (32.7)	< 0.001
Female	1143 (61.7)	6084 (67.3)
Age b (years), median (minimum-maximum)	21.0 (16–47)	20.0 (18–50)	< 0.001

^a One Sample t Test was performed in SPSS Statistics 24.0 (IBM Corp., Armonk, N.Y., USA) to obtain P values

^b The Independent samples t Test was performed in SPSS Statistics 24.0 (IBM Corp., Armonk, N.Y., USA) to obtain P value